Carrying scraper



June 1, 1943. J, J. LOW

CARRYING SCRAPER 3 Sheets-Sfieet 1 Filed July 6, 1938 W v, W J M 7 m ZW 0 J a. N W

June 1, 1943. J. J. LOW

CARRYING SCRAPER Filed July 6, 1938 5 Sheets-Sheet 2 v, 5 mm mm, W W N U N J M n m v IE. m \V Y hv .w\ vs W NW \N Q NM mm 7 km. NW 7 m r .vi, v T mm 6 A M. m6 k\ w M v 2 5v 3 LI Mb v 9v In June 1, 1943.

J. J. LOW

CARRYING SCRAPER 3 Sheets-Sheet 5 Filed July 6, 1958 RW 00 mi r v WM 0 J Br 6mm DJWJ,

Patented June 1, 1943 2,320,625 CARRYING scRArEn John J. Low, Los Angeles, Calif., assignor to Kay- Brunner Steel Products, Inc., a corporation of Delaware Application July 6, 1938, Serial No. 217,658

8 Claims.

My invention relates generally to earth moving apparatus, and particularly to carrying scrapers of that type havin a bowl, an apron at the front of the bowl movable to occupy closed position and various top of the bowl forwardly therethrough to an advanced position at the front of the bowl for ejecting or discharging earth therefrom.

It is a purpose of my invention to provide a carrying scraper of the above iescribed type which embodies a mechanism operatively conmeeting the ejector to the apro by which positive actuation of the ejector in both directions of movement is effected through operation of the apron, but wherein movement of the ejector from retracted to advanced position is initiated only after the apron has reached an open position in which it does not obstruct ejection of earth from the bowl by the ejector.

It is also a purpose of my invention to provide an operating mechanism for the ejector which is characterized by its yieldability to preclude breakage of any of its parts.

A further purpose of my invention is the provision in a carrying scraper of an apron and ejector where the two are mounted to swing about different axes to avoid the breaking strains as set up when mounting them on a single axis, and where the axes are one in advance of the other to permit of a compact arrangement of bowl, apron and ejector.

Another purpose of my invention is the provision in a carrying scraper of anovel arrangement of carrier frame and bowl, and a cable operated mechanism for actuatin the frame to lift the bowl, such mechanism providing a leverage system which minimizes the pull exerted on and, hence, reduces the possibility of breakage of the cable in lifting the bowl.

Another purpose of my invention is to provide a bowl lifting mechanism as set forth in the preceding paragraph wherein an adjustment of such mechanism is permitted to support the bowl ina transversely tilted position and thereby cause end to end tilting of the scraping blade carried by the bowl whereby the bowl is caused to scrape the earth at any desired angle to the horizontal in the formation of a road, for example, inclined transversely.

This lift mechanism is shown and described in my co-pending divisional case, Serial No. 284,875, filed July 17, 1939.

I will describe only one form of carrying scrapopen positions, and an ejector, movable from a retracted position at the back or er embodying my invention, and will then point out the novel features thereof in claims.

Fig. 1 is a view showing in top plan one form of carrying scraper embodying my invention.

,Fig. 2 is a view showing the carrying scraper in side elevation and in earth scraping position.

Fig. 3 is a view similar to Fig. 2, but partly in vertical section and with the bowl in carrying position.

Fig. 4 is a vertical transverse sectional view taken on line 4-4 of Fig. 2, but on a reduced scale.

In carrying out my invention I provide a main frame A made up of inclined side beams l5, l5 connected at their forward and upper ends by a cross beam l6 having a medial and forward extension H from which depends a standard l8. At

its lower end the standard is pivoted at I!) on a block which is turnably mounted on an axle 2| of a front wheel truck 22, which has a draw bar 22a.adapted for connection to a tractor.

A second frame B is pivoted on the frame A between the side beams l5 for movement about a transverse and horizontal axis. The frame B comprises an upper rigid structure substantially square and having side beams 23, 23, and a rear cross beam 25. Rigidly fixed to and depending from the front and rear ends of the side beams 23 are four corner beams 26, 26, and 21, 21 rigidly connected at points above their lower ends by a pair of side beams 28.

As best shown in Fig. 2, the rear ends of the beams 28 are rigidly connected by a cross beam 29, and to the center of the beams and 29 rigid frames 30 and 3 I, respectively, are secured to coact with an axle 32 and wheels 33 in forming a rear wheel truck for the scraper.

An axle 34 is mounted in and extends through the beams 21, and on the ends of this axle the rear ends of the beams I5 are pivoted to allow vertical movement of the frame B relative-to the frame A but about the axle 32 as a center. The frame B has secured therein a bowl 0 which includes a pair of side plates 35 between which is a combined bottom and end plate 36 curved downwardly and forwardly to a V-shaped shoe 3'! to which a scraping blade 38 is secured.

For actuating the frame B to from scraping positions to carrying position the following mechanism is provided: A pair of turnbuckles 39 are secured to the corner beams 26, and to a pair of rods 40 with the latter in turn pivotally connected to a pair of arms 4| fixed to the opposite ends of a shaft 42 journaled in bearings 43 secured to the cross beam l6. Fixed to the shaft 42 at a point between those bearings 43 at the center of the shaft, are a pair of relatively long arms 44 disposed substantially at right angles to the shorter arms 4|.

Sheaves 45 are mounted between the free ends of the arms 44, while a companion set of sheaves 46 are supported on a shaft 41 carried by a block 48 secured on the extension H. A cable 49 is extended around both sets of sheaves and secured at one end to one set of sheaves or the other, while the other end of the cable is extended downwardly at the front side of the standard and beneath a sheave 50 on a shaft 50a and then to the tractor to which the scraper is adapted to be connected.

The bowl lifting mechanism just described operates as follows: By pulling on the cable 49 the arms 44 are rocked forwardly to rotate the shaft 42 and thus lift the arms 4| to elevate the rods 40 and the turnbuckles 39. With elevation of the turnbuckles the front end of the frame B is lifted to raise the bowl C from scraping position to carrying position.

Manifestly, the multiplication in the power applied to the cable 49 secured by the sheaves 45 and 48, and the compound leverage attained by the arms 4| and 44, combine to secure lifting of the bowl and the other elements carried by the frame B with a. minimum pull on the cable 49 thereby reducing the possibility of breakage of the cable.

The turnbuckles 39 provide an adjustment by which the two sides of the frame B can be vertically adjusted and independently of each other to cause a transverse tilting or twisting of the frame B to one side or the other. This effects a corresponding end to end tilting of the scraping blade 38 so that the blade will be caused to scrape the earth at the desired angle to the horizontal in the formation of a transversely inclined road or the like. It is to be understood that in practice the degree of blade tilt under any of the uses for which this adjustment is designed, is only slight and may not exceed one inch. Whatever binding of the pivots 34 occurs as a result of this adjustment, is negligible and does not interfere with the normal operation of the apparatus.

For retaining the earth in the bowl C after loading, a conventional apron D is provided which includes a pair of side arms 6i pivoted on trunnions 62 secured to the beams 23 so that the apron is movable between the sides of the frame B to occupy open and closed positions with respect to the bowl.

The mechanism for lifting the apron D comprises a set of sheaves 63 carried in a block 64 secured to the apron medially of its width, and another set of sheaves'65 carried in an inverted U-shaped cross beam 66 secured to, spanning and rising above the forward ends of the side beams 23. A cable 61 is extended around the two sets of sheaves with one end secured to the set 65 and the other end extended forwardly over a sheave 68 on the shaft 41,, and then beneath a sheave 69 on the shaft 500, from which it leads to the tractor.

Manifestly, the cable 61 is operable to lift the sheaves 63 and thereby swing the apron D upwardly about the trunnions 62 as a center.

For effecting complete discharge of all earth from the bowl when it is desired to unload the same, an ejector E is provided which is in the form of a swinging frame. At its forward edge the ejector is fixed to a shaft HI journaled in bearings. 11 secured to the beams 23.- Th? Qidownwardly mensions of the ejector and the mounting of the shaft 10 are such that the ejector can sweep downwardly and forwardly through the bowl C in an arc substantially parallel to the arc of the bowl bottom 36, and from the retracted position shown in solid lines in Fig. 3 to the advanced position shown in dotted lines. The retracted position of the ejector is restricted to a horizontal position at the top of the bowl by the provision of a pair of stops 12 located and fixed on the rear ends of the beams 23.

For actuating the ejector, the motion of the apron is utilized through a mechanism which provides a positive yet yielding connection between the apron and ejector to prevent damage to the parts of the mechanism, and also a. delay in movement of the ejector from retracted position until the apron has reached an open position in which it does not obstruct discharge of earth from the bowl by the ejector. By this mode of operation the possibility is eliminated of the ejector moving against the body of earth held immovable in the bowl by the apron, and thus breaking the mechanism or the cable 61 for actuating the apron.

The ejector actuating mechanism comprises a pair of arms 13 fixed to the ends of the shaft 10 and pivotally connected to a'pair of rods 14. Each rod carries a loosely fitted sleeve 15 pivotally connected by a pin 16 to a bracket 11 fixed to the corresponding arm 6|. Mounted on the rod 14 at opposite sides of the sleeve 15 are springs 18 and 19. The spring 18 engages an abutment fix d on the rod, while the spring 19 is movable bodily on the rod to engage an abutment 8i in the form of a flanged nut secured on the rod by a lock nut, as shown.

The operation of the ejector actuating mechanism will be understood from a consideration of Fig. 3. With the apron in closed position as shown in solid lines in Fig. 3, the ejector occupies retracted position as defined by the stops 12. In this position the springs 18 are compressed, while the springs 19 are uncompressed and spaced from the abutments 8!. Upon lifting the apron to the dash line position the rods are swung to the dash line position and about their pivotal connections with the arms 13 as a center, there being no movement of the arms 13 at this point, and hence no movement of the ejector. During this movement of the rods the sleeves i5 slide upwardly thereon to first move the springs 19 against the abutments 8i as shown in Fig. 2, and then fully compress the springs. At the same time the springs 18 are relieved of any compres- In this dash line position of the apron the bowl is partly opened to allow that earth which is free to do so to gravitate from the bowl. By now lifting the apron to the dotted line position, which is the full open position thereof, the springs I9 being under full compression provide a positive connection between the rods and sleeves so that as they are swung upwardly the arms 13 are moved to swing the ejector to the advanced position shown in dotted lines, thereby sweeping the remaining earth from the bowl. Thus it becomes apparent that advancing movement of the ejector is not initiated until the apron has reached a position in which it forms no obstrucby the ejector, and other springs and arms occurs to-return the ejector to retracted position and thereby permit reloading of the bowl. During this operation the springs 18 are gradually compressed by the sleeves 75 so as to not only cushion the apron in its movement to closed position, but also to cushion the ejector in its movement to retracted position against the stops. In this manner the possibility is prevented of breaking the mechanism between the apron and ejector should the apron be dropped rather than lowered.

Although I have herein shown and described only one form of carrying scraper embodying my invention, it is to be understood that various changes and modifications may be made herein without departing from the spirit of my invention and the spiritand scope of the appended claims.

I claim:

1. A scraper, comprising; a bowl; an apron at the front of the bowl movable to occupy open and closed positions with respect to the bowl; an ejector movable in the bowl to or from a retracted position at the back of the bowl to or from an advanced position at thefront of the bowl; and a mechanism operatively' connecting the apron and ejector for advancing or retracting the apron is opened or closed, said mechamsm including elements relatively movable; springs so associated with the elements that movement of the ejector from retracted position is initiated only after the apron has been moved to an open position in which it does not obstruct ejectionof earth from the bowl springs so associated with the elements as to cushion movement of the ejector back to retracted position.

2. A scraper, comprising; a bowl; an apron at the front of the bowl movable to occupy open and closed positions with respect: to the bowl;

an ejector movable in the bowl to or from a retracted position at the back of .the bowl to or from an advanced position at the front of the bowl; and a mechanism operatively connecting the apron and ejector for advancing or retractthe apron, springs on the rods at opposite sides of the sleeves, and abutments on the rods so controlling compression of the springs by the sleeves that movement of the ejector from retracted position is initiated only after the apron has been moved to an open position, and cushioning of the ejector in its movement to retracted position is effected.

3. A scraper, comprising; frame; an apron pivoted on said frame to occupy open and closed positions at the front of the bowl; an ejector pivoted on said frame forwardly of the pivot of the apron and to occupy retracted and advanced positions in the bowl;

a bowl-carrying I the ejector back to retracted position against said from an advanced position and advanced 5. A scraper, comprising; a frame; a bowl on on the frame to octhe frame; an apron pivoted cupy open and closed positions at the front of the bowl; an ejector pivoted on thev frame so as to be movable in the bowl to or from a retractedposition at the top of the back of the bowl to or at the front of-the for limiting upward the back of the bowl;

bowl; stops on the frame movement of the ejector at and a mechanism operatively connecting the apron and ejector for advancing or retracting the ejector according as the apron is opened or closed,

stops.

6. A scraper, comprising;

i l I a bowl; an apron at the front of the bowl movable to occupy open and closed positions with respect to the bowl; an ejector movable in the bowl to or from a retracted position at the back of the bowl to or from an advanced position at the front of the bowl; and a mechanism operatively connecting the apron and ejector for advancing or retracting the ejector according as the apron is opened or closed, said mechanism including an arm fixed to the ejector, a rod pivoted on the arm, a sleeve slidable on the rod and pivotally connected to the apron, a spring on the rod at one side of the sleeve, and an abutment on the rod to control compression of the spring by the sleeve so that movement of the ejector from is initiated only to open positio 7. A scraper, comprising; a bowl-carrying frame; an apron pivoted on said frame to occupy open and closed positions at the front of the bowl; an ejector pivoted on said frame forwardly of the pivot of the apron and to occupy retracted and advanced positions in the bowl; and mechanism operatively connecting the apron and ejector so that according as the apron is moved to occupy open or closed position the ejector will be moved to occupy advanced or retractedposition, said mechanism including spring means for deafter the apron has been moved laying movement of the ejector from retracted and mechanism operatively connecting the apron as the apron is position the ejecto occupy advanced or re;

position until the apron has been moved to an open position.

8. A scraper, comprising; a bowl; an apron at the front of the bowl movable to occupy open and closed positions with respect to the bowl; an ejector movable in the bowl to or from a retracted position at the back of the bowl to or from an advanced position at the front of the bowl; and a mechanism operatively connecting the apron and ejector for advancing or retracting the ejector according as the apron is opened or closed, said mechanism to the 5 ejector and slidably mounted on the apron, and resilient elements associated with saidmeans so as to resist sliding movement of said means as the apron approaches fully open position and to cause actuation of said means to move the ejector to advanced position.

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retracted position including means fixed 

